Insidious Roots, Peregrin Took, Cauldron Familiar, and Altar of Dementia

Prerequisites

• Insidious Roots on the battlefield
• Peregrin Took on the battlefield
• Cauldron Familiar on the battlefield
• Altar of Dementia on the battlefield
• You control at least one Food

Steps

1. Activate Altar of Dementia by sacrificing Cauldron Familiar, causing target player to mill cards equal to Cauldron Familiar's power
2. Activate Cauldron Familiar by sacrificing a Food, returning Cauldron Familiar to the battlefield from your graveyard
3. Cauldron Familiar and Insidious Roots trigger
4. Resolve the Insidious Roots trigger, creating a 0/1 green Plant creature token and a Food artifact token, and then putting a +1/+1 counter on each Plant you control
5. Resolve the Cauldron Familiar trigger, causing each opponent to lose 1 life and you to gain 1 life
6. Repeat

Results

• Infinite +1/+1 counters on Plants you control
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers
• Infinite lifeloss
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill